\xiti

\begin{xiaotis}

把下列各式分解因式（第 1～4 题）：

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$x^2 + 9x + 8$；} & \xxt{$x^2 - 10x + 24$；} \\
        \xxt{$x^2 + 3x - 10$；} & \xxt{$x^2 - 3x - 28$；} \\
        \xxt{$a^2 + 4a - 21$；} & \xxt{$m^2 + 4m - 12$；} \\
        \xxt{$p^2 - 8p + 7$；} & \xxt{$b^2 + 11b + 28$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$x^4 + 7x^2 - 18$；} & \xxt{$x^6 + 8x^3 + 15$；} \\
        \xxt{$m^2x^2 - 8mx + 12$；} & \xxt{$x^2y^2 - 7xy + 10$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$x^2 - 7xy + 12y^2$；} & \xxt{$a^2 + 2ab - 15b^2$；} \\
        \xxt{$m^2 + 4mn - 12n^2$；} & \xxt{$p^2 + 9pq + 18q^2$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$-x^2y + 6xy - 8y$；} & \xxt{$(m + n)^2 - (m + n) - 30$；} \\
        \xxt{$ab^2 + 4abc + 3ac^2$；} & \xxt{$(x - y)^2 - 3(x - y) - 40$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{先把下列各式分解因式，然后指出每道题中三个式子的公因式：}
\begin{xiaoxiaotis}

    \xxt{$x^2 + 9x + 14$， $x^3 - 49x$ 与 $x^2 + 2x - 35$；}

    \xxt{$x^2 + 2x - 63$， $x^2 + 18x + 81$  与 $x^2 + 12x + 27$。}

\end{xiaoxiaotis}

把下列各式分解因式（第 6～14 题）：

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$am + an + bm + bn$；} & \xxt{$xy - xz + y - z$；} \\
        \xxt{$a^2 + ab + ac + bc$；} & \xxt{$ax - 2bx + ay - 2by$；} \\
        \xxt{$4xy - 3xz + 8y - 6z$；} & \xxt{$x^3 + 3x^2 + 3x + 9$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$3xy - 2x - 12y + 8$；} & \xxt{$ab - 5bc - 2a^2 + 10ac$；} \\
        \xxt{$5ax + 7ay - 5bx - 7by$；} & \xxt{$x^3y  + 3x - 2x^2y^2 - 6y$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$6ax + 15b^2y^2 - 6b^2x - 15ay^2$；} & \xxt{$7x^2 - 3y + xy - 21x$；} \\
        \xxt{$3a^2  + bc - 3ac - ab$；} & \xxt{$a^2m + bn - an - abm$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$x^2 - a^2 - 2x - 2a$；} & \xxt{$a^3 - b^3 - a + b$；} \\
        \xxt{$4x^2 - 4xy + y^2 - a^2$；} & \xxt{$1 - m^2 - n^2 + 2mn$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$a - a^3$；} & \xxt{$x^3 - 15x^2 - 16x$；} \\
        \xxt{$x^3y - xy^3$；} & \xxt{$5x^5 - 15x^3y - 20xy^2$；} \\
        \xxt{$x + x^4$；} & \xxt{$a^4b - ab^4$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$(x^2 + 3x)^2 - (2x + 6)^2$；} & \xxt{$1 - 26a^2 + 25a^4$；} \\
        \xxt{$(x^2 + 2x)^2 - 7(x^2 + 2x) - 8$；} & \xxt{$a^6 + 7a^3 - 8$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$4x^2 - y^2 + 2x - y$；} & \xxt{$(x + y)^4 + (x + y)^2 - 20$；} \\
        \xxt{$a^4 + a^3 + a + 1$；} & \xxt{$x^4y + 2x^3y^2 - x^2y - 2xy^2$。}
    \end{tblr}

\end{xiaoxiaotis}

\begin{withstar}
\renewcommand{\huitui}{\hspace*{-2em}}
\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$2x^2 + 3x + 1$；} & \xxt{$2y^2 + y - 6$；} \\
        \xxt{$6x^2 - 13x + 6$；} & \xxt{$3a^2 - 7a - 6$；} \\
        \xxt{$4n^2 + 4n - 15$；} & \xxt{$6l^2 + l - 35$。}
    \end{tblr}

\end{xiaoxiaotis}

\xiaoti{}%
\begin{xiaoxiaotis}%
    \huitui\begin{tblr}[t]{columns={18em, colsep=0pt}}
        \xxt{$6x^2 - 11xy + 3y^2$；} & \xxt{$4m^2 + 8mn + 3n^2$；} \\
        \xxt{$16x^2 - 31xy - 2y^2$；} & \xxt{$8m^2 - 22mn + 15n^2$。}
    \end{tblr}

\end{xiaoxiaotis}
\end{withstar}

\end{xiaotis}
%\vspace*{1em}

